docs: add readme

README.cn.md

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+# 关于
+
+FwLib_STC8 是面向 STC8G/STC8H 系列 MCU 的C语言封装库
+
+# 特性
+
+* 与 SDCC 和 Keil C51 兼容
+* 为8位MCU的受限资源优化
+* 以易读的代码形式提供片上资源的操作
+* 丰富的演示例程用于快速上手
+
+# PlatformIO 快速上手
+
+1. 将代码仓库克隆到本地目录
+```bash
+# GitHub
+git clone https://github.com/IOsetting/FwLib_STC8.git FwLib_STC8
+# or Giteee (for Chinese users)
+git clone https://gitee.com/iosetting/fw-lib_-stc8.git FwLib_STC8
+```
+2. 复制(或移动)到 PlatformIO 项目的lib目录下
+```
+├── include
+├── lib
+│   └── FwLib_STC8
+│       ├── demo
+│       ├── include
+│       └── src
+├── src
+└── test
+```
+3. 在代码中引用 `fw_hal.h`后, 就可以开始使用了
+```c
+#include "fw_hal.h"
+```
+
+4. 更多的使用细节, 请查看demo中的例程代码.
+
+
+# Keil C51 快速上手
+
+1. 将代码仓库克隆到本地目录
+```bash
+# GitHub
+git clone https://github.com/IOsetting/FwLib_STC8.git FwLib_STC8
+# or Giteee (for Chinese users)
+git clone https://gitee.com/iosetting/fw-lib_-stc8.git FwLib_STC8
+```
+2. 复制(或移动)到 Keil C51 项目目录下
+3. 将其通过 Project -> Manage -> Project Items, 添加到项目文件中
+4. 在代码中引用 `fw_hal.h`后, 就可以开始使用了
+```c
+#include "fw_hal.h"
+```
+
+
+# 授权
+
+Copyright (c) 2021-present IOsetting <iosetting@outlook.com>
+
+FwLib_STC8 使用 Apache 2.0 协议授权, 可以使用于个人及商业项目.

README.md

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+# About
+
+FwLib_STC8 is a lite firmware library for STC8G/STC8H series MCU.
+
+# Features
+
+* Compatible with SDCC and Keil C51
+* Optimized for constrained 8-bit MCU resources
+* Readable code for on-chip resources operation
+* Demos for quick start
+
+# PlatformIO Quick Start
+
+1. Clone this repository to local file system
+```bash
+# GitHub
+git clone https://github.com/IOsetting/FwLib_STC8.git FwLib_STC8
+# or Giteee (for Chinese users)
+git clone https://gitee.com/iosetting/fw-lib_-stc8.git FwLib_STC8
+```
+2. Copy(or move) it to your PlatformIO project library, the file structure
+```
+├── include
+├── lib
+│   └── FwLib_STC8
+│       ├── demo
+│       ├── include
+│       └── src
+├── src
+└── test
+```
+3. Include `fw_hal.h` in your code
+```c
+#include "fw_hal.h"
+```
+then it's ready to use.
+
+4. For more detailed usage, please check the code in demos
+
+
+# Keil C51 Quick Start
+
+1. Clone this repository to local file system
+```bash
+# GitHub
+git clone https://github.com/IOsetting/FwLib_STC8.git FwLib_STC8
+# or Giteee (for Chinese users)
+git clone https://gitee.com/iosetting/fw-lib_-stc8.git FwLib_STC8
+```
+2. Copy(or move) it to your Keil C51 project directory, 
+3. Add it to project through Project -> Manage -> Project Items,
+4. Include `fw_hal.h` in your code
+```c
+#include "fw_hal.h"
+```
+then it's ready to use.
+
+
+# License
+
+Copyright (c) 2021-present IOsetting <iosetting@outlook.com>
+
+The FwLib_STC8 is licensed under the permissive Apache 2.0 license, you can use it in both commercial and personal projects with confidence.